Phase comparator system
First Claim
1. An interrogator for use in a range finding system comprising interrogator means and transponder means for generating and transmitting an interrogation signal having a first encoded portion and a first basic tone portion and a responsive signal having a second encoded portion and a second basic tone portion, in which said transponder means responds to said interrogation signal to generate and transmit said responsive signal with said second encoded and basic tone portions thereof being phase synchronous with said first encoded and basic tone portions as received at said transponder means, and in which said interrogator means comprises:
- signal generating means for generating said interrogation signal and for storing the phases of said first encoded and basic tone portions of said interrogation signal;
first means for determining the difference between the stored phase of said first encoded portion of said interrogation signal and the phase of said second encoded portion of the received responsive signal;
second means for determining the difference between the stored phase of said first basic tone of said interrogation signal and the phase of said second basic tone portion of the received responsive signal to produce a first signal whose frequency is proportional to said phase difference and a second signal indicating the leading or lagging phase relationship of said first and second basic tones;
up/down counter means constructed to count at a rate determined by the frequency of said first signal and in a direction determined by said second signal; and
said signal generating means comprising means responsive to the count in said up/down counter means to alter the stored phase of said first basic tone portion towards synchronization with the phase of said received second basic tone until phase synchronization is attained.
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Accused Products
Abstract
An improved interrogation means in a range finding system having signal generating means for generating interrogation signals having a first encoded portion and a first basic tone portion. A transponder means responds to said interrogation signal to generate and transmit a responsive signal having a second encoded portion and a second basic tone portion phase synchronous with said first encoded and basic tone portions as received at the transponder. The interrogator means has further means for storing the phases of the first encoded and basic tone portions after transmission thereof and other means for determining the difference between the stored phase of the first encoded portion and the phase of the received second encoded portion. A third means determines the difference between the stored phase of the first basic tone portion and the phase of the received second basic tone portion to produce a first signal whose frequency is proportional to said phase difference and a second signal indicating the leading or lagging phase relationship of said first and second basic tones. Up/down counter means counts at a rate determined by the frequency of said first signal and in a direction determined by said second signal. The signal generating means responds to the count in said up/down counter to alter the stored phase of said first basic tone portion to become phase synchronized with the phase of said received second basic tone.
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Citations
8 Claims
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1. An interrogator for use in a range finding system comprising interrogator means and transponder means for generating and transmitting an interrogation signal having a first encoded portion and a first basic tone portion and a responsive signal having a second encoded portion and a second basic tone portion, in which said transponder means responds to said interrogation signal to generate and transmit said responsive signal with said second encoded and basic tone portions thereof being phase synchronous with said first encoded and basic tone portions as received at said transponder means, and in which said interrogator means comprises:
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signal generating means for generating said interrogation signal and for storing the phases of said first encoded and basic tone portions of said interrogation signal; first means for determining the difference between the stored phase of said first encoded portion of said interrogation signal and the phase of said second encoded portion of the received responsive signal; second means for determining the difference between the stored phase of said first basic tone of said interrogation signal and the phase of said second basic tone portion of the received responsive signal to produce a first signal whose frequency is proportional to said phase difference and a second signal indicating the leading or lagging phase relationship of said first and second basic tones; up/down counter means constructed to count at a rate determined by the frequency of said first signal and in a direction determined by said second signal; and said signal generating means comprising means responsive to the count in said up/down counter means to alter the stored phase of said first basic tone portion towards synchronization with the phase of said received second basic tone until phase synchronization is attained. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for phase synchronizing a locally generated first signal with a received signal and comprising:
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signal generating means for generating said first signal; phase comparator means responsive to said first and received signals to produce an error voltage whose amplitude is proportional to the phase difference between said first and received signals and whose polarity is indicative of the leading or lagging phase relationship between said first and received signals; means responsive to said error voltage to produce a control signal having a variable frequency which varies in response to the amplitude of said error voltage; and up/down counter means responsive to said control signal to count at a rate proportional to the frequency thereof and in a direction determined by the polarity of said error voltage; said signal generating means directly responsive to the count in said up/down counter means to alter the phase of said first signal to become synchronous with the phase of said received signal. - View Dependent Claims (8)
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Specification